Radial velocity (vrad)

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Radial velocity (vrad)#

vrad in PySME is segment-aware and has two functions (with vrad_flag):

  • fit RV from observation vs. synthetic spectrum

  • apply RV shift to synthetic spectrum before comparison

Core parameters#

  • vrad: radial velocity in km/s for each segment

  • vrad_flag: controls how RV is determined

    • none: no RV fitting

    • fix: use the current sme.vrad to shift the synthetic spectra and do not change it

    • each: fit one RV per segment

    • whole: fit one shared RV from all selected segments

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